On the issue of free replacement of Apple mobile phones within two years.

You should have purchased Apple's iPhone AppleCare maintenance plan, that is, extended warranty service. You can directly use the serial number or serial number of your mobile phone to check the remaining warranty time in Apple official website. If you are still under warranty, you can go to any Apple authorized after-sales service or Apple direct store for warranty. It doesn't matter if you don't have to go to the store and don't bring the purchase invoice. Generally, you can bring a machine, and it is best to bring a warranty card. However, there is a problem. Your so-called mobile phone doesn't work well. You can change it if you want. Apple must admit after the after-sales service. Only people who need to change their mobile phones can change them. Anyone who says my mobile phone doesn't work well can change it for you. If it really needs to be repaired, Apple will do a test after-sales service, and I will change it for you after confirming that it needs to be changed ~ ~